Unit B Chapter 2 Lesson 3 Ways in Which Organisms Compete I

Document Sample
Unit B Chapter 2 Lesson 3 Ways in Which Organisms Compete I Powered By Docstoc
					Unit B Chapter 2
Lesson 3
Ways in Which Organisms Compete

 I. Competition for Limited Resources
     A. Food is a resource
           1. Animals get it differently
           2. Ecosystems have limited supplies
           3. Competition (a contest) among organisms
              for resources
                 a. Survival
                       i. Body color helps with survival
                      ii. Camouflage – body color that
                          helps organisms hide from
                    iii. Predator – An organism that
                          preys on a consumer
                     iv. Prey – A producer that is
                          consumed by a predator
                 b. Water
                       i. Needed by all organisms
                 c. Shelter
                 d. Plants compete for resources also
                       i. Water
                   ii. Sunlight
              e. Adaptations help with competition
              f. Organisms share resources
                    i. Compete in different ways
                   ii. Some hunt in packs
                  iii. Some hunt individually
              g. An ecosystem must be kept in
  Question – What are two resources that organisms
             may compete for?
  Answer – Organisms may compete for food, water,
             sunlight, and shelter.

II. Sharing Resources
      A. Many organisms share an ecosystem
      B. These organisms do not have to compete
              1. Occupy their own niche in the
              2. Some organisms aid other organisms in
                 finding a habitat
   Question – Why don’t warblers compete for food,
              even though they all eat insects in the
              same tree?
   Answer – Warblers do not compete for their foods
              because they feed at different levels of the
              tree. They have a different “niche.”

III. Symbiosis
     A. Symbiosis – A long term relationship between
                       two different organisms
                 1. It can benefit one, or both, organisms
     B. Different organisms often live closely together
        for most of their lives in the same niche.
     C. Mutualism – A relationship where both
        organisms receive benefit(s)
                 1. Organisms can be plant or animal
   Question – What is symbiosis?
   Answer – Symbiosis is a long term relationship
             between different kinds organisms that is
             beneficial to all.
IV. Instincts and Learned Behaviors
     A. Behaviors –
                 1. Instinct – Behavior that an organism
                          a. It is not unique to the
                          b. Behavior shared
                                i. By that entire population
                             ii. Or by males or females
                                 of the population
                 2. Learned Behavior – A behavior that
                    they have learned from their parents
                         a. Not inherited
                         b. Mainly used for survival
                         c. Domesticated animals have
                            many learned behaviors that
                            are not necessary for survival
  Question – What is the difference between an
              instinct and a learned behavior?
  Answer – An instinct is inherited, you are born with
            it, and a learned behavior is not, it is
            taught to you.

V. Summary
      A. Organisms may compete for limited resources
         in an ecosystem
      B. The sizes of certain populations are limited by
         the amount of resources available
      C. Sometimes organisms share resources
      D. Sometimes they form relationships with other
      E. Instincts –
             1. Inherited
             2. Learned behaviors
             3. Help organisms survive

VI. Review
          1. Question – Why does a female sea turtle lay
            more than a thousand eggs at a time?
            Answer –

          2. Question – How might the number of oak
            trees in a park affect the number of squirrels
            that can live there?
            Answer –

          3. Question - What resources are sometimes
             shared by squirrels and certain birds?
             Answer –

          4. Critical Thinking – Think of an animal that
             lives in your area. What behaviors does it
             have for survival?
             Answer –
5. Test Prep – Which of the following is not a
  survival instinct for birds?
                 a. Building nests
                 b. Migrating
                 c. Eating insects
                 d. Learning to talk

Shared By: